Are we truly entering an era of "Cities 3.0"? Sacramento Mayor Kevin Johnson is an advocate of that notion, and few elected officials are in a better position to look at cities from a broad, historical perspective than is Johnson, the new president of the U.S. Conference of Mayors.
He laid out that perspective in his inaugural speech as the conference's president, describing how the first generation of cities was built around ports, rivers and transportation routes. Then came the Industrial Revolution and Cities 2.0. In addition to factory smokestacks, they had electricity, transportation systems and other modern services. In the new era of Cities 3.0, Johnson said, "the city is a hub of innovation, entrepreneurship and technology. It's paperless, wireless and cashless."